package com.esm.pdawms.util;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class CrashHandler implements UncaughtExceptionHandler {

    public static final String TAGINFO = "ERROR";

    public static final String TAG = "CrashHandler";
    // CrashHandler实例
    private static final CrashHandler INSTANCE = new CrashHandler();
    // 系统默认的UncaughtException处理类
    private UncaughtExceptionHandler mDefaultHandler;
    // 程序的Context对象
    private Context mContext;

    // 用来存储设备信息和异常信息
    private final Map<String, String> infos = new HashMap<String, String>();

    // 用于格式化日期,作为日志文件名的一部分
    private final DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

    /**
     * 保证只有一个CrashHandler实例
     */
    private CrashHandler() {
    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public void init(Context context) {
        mContext = context;
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            //如果用户没有处理则让系统默认的异常处理器来处理  
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
//            try {  
//                Thread.sleep(3000);  
//            } catch (InterruptedException e) {  
//                Log.d(TAG, "error : "+ e);  
//            }  
            //退出程序
          /*  ExitSystem es = new ExitSystem(mContext);
            es.setExitFlag(true);
            es.onExit();*/

            // 没有有效的出错后退出软件的机制钱，出错记录后依然交给系统管理
            mDefaultHandler.uncaughtException(thread, ex);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
//        //使用Toast来显示异常信息  
//        new Thread() {  
//            @Override  
//            public void run() {  
//                Looper.prepare();  
//                Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_LONG).show();  
//                Looper.loop();  
//            }  
//        }.start();

        /* mContext.startService(new Intent(mContext, LockService.class));*/

        //收集设备参数信息   
        collectDeviceInfo(mContext);
        //保存日志文件   
        saveCrashInfo2File(ex);

        //异常后自动重启APP
        reset();
        //
        return true;
    }

    void reset() {
        Intent intent = mContext.getPackageManager().getLaunchIntentForPackage(mContext.getPackageName());
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);//与正常页面跳转一样可传递序列化数据,在Launch页面内获得
        intent.putExtra("REBOOT","reboot");
        mContext.startActivity(intent);
//        startActivity(new Intent(this, LoginActivity.class));
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            Log.d(TAG, "an error occured when collect package info" + e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.d(TAG, "an error occured when collect crash info" + e);
            }
        }
    }

    public String getFilesPath(Context context) {
        String filePath;
        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
                || !Environment.isExternalStorageRemovable()) {
//外部存储可用
            filePath = context.getExternalFilesDir(null).getPath();
        } else {
//外部存储不可用
            filePath = context.getFilesDir().getPath();
        }
        return filePath;
    }

    /**
     * 保存错误信息到文件中
     *
     * @param ex
     * @return 返回文件名称, 便于将文件传送到服务器
     */
    private String saveCrashInfo2File(Throwable ex) {

        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        Log.e(TAGINFO, result);

        sb.append(result);
        try {
            long timestamp = System.currentTimeMillis();
            String time = formatter.format(new Date());
            String fileName = "crash-" + time + "-" + timestamp + ".txt";
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                // /storage/emulated/0/Android/data/com.example.view/files
                // /storage/emulated/0/ESM/logs/
                String path1 = Environment.getExternalStorageDirectory() + "/ESM/logs/";
                String path = getFilesPath(mContext) + "/ESM/logs/";
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                String name = path + fileName;
                FileOutputStream fos = new FileOutputStream(name);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            Log.d(TAG, "an error occured while writing file..." + e);
        }
        return null;
    }

}
